Transcription of CHAPTER 6 NOTES: The Periodic Table
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CHAPTER 6 NOTES: The Periodic Table
CHAPTER 6 NOTES: The Periodic TableNOTES: Periodic Table Organizing the ElementsPERIODIC Table : Dmitri Mendeleev mid 1800 s-proposed a Table for 70 elements based on increasing mass and similar properties Henry Moseley 1913-determined the atomic number of elements and arranged the Table in order of increasing atomic numberPeriodic Table Periodicity:( Periodic LAW ) -regular variations (or patterns) of propertieswith increasing atomic weight; both chemical and physical properties vary in a Periodic way (repeating pattern). Group:vertical column of elements( family ) Period:horizontal row of elementsPeriodic Groups and TrendsGroupings to know on the Periodic Table Representative Elements: Group A elements; columns 1A-8A; they include:-metals-nonmetals-metalloidsMETA LS:Characteristics: high electrical conductivity high luster ductile & malleable on the left side of the Periodic Table (except hydrogen)NONMETALS:Characteristics: in the upper-right corner of the Periodic Table nonlustrous poor conductors of electricity some (O, Cl) are gases at room temp.
Soft solids Readily combine with halogens Tendency to lose one electron examples: sodium, potassium, cesium. Alkaline Earth Metals ... 2 to form salts (ionic bonds) examples: fluorine, bromine, iodine. Noble Gases Group 18 on periodic table Relatively inert, or nonreactive
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